Brace



(No Model.)

G. LARSON.

BRAOB.

No. 468,771. Patented Feb. 9, 18-92.

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ing the details of construction.

UNITED STATES PATENT OFFICE.

GUST. LARSON, OF ALEXANDRIA, ASSIGNOR TO IVILLIAM O. SMITH AND THOMAS F.MOORE, OF YVADENA, MINNESOTA.

'BRACE.

SPECIFICATION forming part of Letters Patent No. 468,771, dated February9, 1892.

Application filed March 14,1891. Serial No. 385,106. (No model.)

To all whom it may concern:

Be it known that I, GUST. LARSON, a citizen of the United States ofAmerica, residing at Alexandria, in the county of Douglas and State ofMinnesota, have invented certain new and useful Improvements in Braces,of which the following is a specification, reference being had thereinto the accompanying. drawings.

My invention relates to an improvement in an ordinary brace and bit; andthe object is to provide a mechanism or device for operating with greatrapidity the bit of a brace in conjunction with the brace orbit-stock--that is, by the aid of my invention the bit upon the forwardrevolutions of the handle of the brace can be made to turn twice to eachrevolution of the handle. I attain said object by a certain combinationand arrangement of parts fully described in this specification, andillustrated in the accompanying drawings, in which Figure l is a view inelevation of my invention complete. Fig. 2 is a longitudinal sectionalview of apart of the same, illustrat- Figs. 3, 4., 5, and 6 are detailedviews of parts to be referred to hereinafter.

Referring to the drawings, the letter A designates a handle with thelower end a bent at a right angle. This handle is provided, uponopposite sides of the end a, with the downwardlyproj ecting pawls a aand is pivotally secured, by means of the screws or pivots b between theends 19 b of the revolving clevisshaped frame B. The projectingportion 1) of this handle performs the function of a guide and brake. Itwill be readily observed that as said handle is pivotallysecured thesame may be moved, so as to cause said pawls to engage the notches c andd, respectively, of either of the crown-wheels O and D. When the handleA is operated so that the pawl a will engage one of the notches 0 uponthe rim of the crown-wheel O, this rigidly holds said crown-wheel in astationary position, thereby permitting the pinion E to drive thecrownwheel D, which imparts motion to the cap I, which drives thebit-socket N. The opposite result is produced when the pawl a is made toengage the notches cl of the crown-wheel Dthat is, the cap I will thenremain sta-- tionary and the portion G will revolve within said cap.

The clevis or U-shaped frame B is so constructed that the bottom portion22 can be removed by taking out the screw-bolts b and b and by thenremoving the handle M and bit-holder N said frame can be readily removedfrom its normal position upon the portion Gr of the bit-stock. Saidportion G of the bit-stock or brace is journaled through the center ofthe top and bottom of the frame B, and is formed with the reducedportions 9 g and g".

The crown-wheels O and D are provided upon their periphery with thenotches c and d, and they are located upon the portion Got the bit-stockat the points g g. In the bottom of the crown-wheel D there are twoorifices d cl, which are adapted to receive the projec tions or keys itupon the top of the cap I, which fits upon the lower end of the portionG of the bit-stock. It will be observed that the lower end or reducedportion g of said portion G revolves within the cap I and that thecrown-wheel D communicates motion to the cap I by means of theprojections or keys h upon the top of cap I, which fit into the orificescl cl upon the bottom of the crown-wheel D. Such being the case, the capI, being rigidly fit into the bit-socket N and revolving upon thereduced portion g of the portion G, drives the bit-socket N, when theupper crown- Wheel O is rigidly held in a stationary position by meansof the pawl a engaging the notches 0 upon the crown-wheel C. When thecrown-Wheel D is rigidly secured by the pawl a engaging the notches dthereof, the bitholder becomes inoperative or is thrown out of gear-thatis, the portion Grevolves within the cap I, and therefore the bit-holderN remains stationary. This obviatesa serious objection heretoforeexperienced in operating brace-bits of this character-namely, that ofpreventing the bit from being broken when the brace is being operated inthe event that the same should suddenly come in contact with a knot orany unusually-hard substance in the wood. The handle A being heldstationary while the brace is operated, it is apparent that should thebit strike any hard substance in operation the tendency is to cause thehandle A to assume in direction the opposite course of the revolvinghandle M. In other words, the handle A is thrown almost instantly, sothat the pawl a will engage the notches d. Hence the bit becomes asquickly inoperative, while the revolvinghandle M may continue to rotate.Should the same be brought suddenly to a standstill, owing to the bitstriking the hard substance, the result invariable would be a brokenbit. This is a novel and decidedly advantageous feature of my inventionand overcomes a serious difficulty heretofore existing.

E represents the revolving pinion, which is located and Works betweenthe crown-wheels O and D, respectively. Said pinion is mounted upon theprojecting axle L, Fig. 6, of the portion G of the bit-stock. Thevaluable and improved results of my invention are chiefly owing to thefunction performed by said revolving pinion. It will readily be seenthat the portion G of the bit-stock or brace (upon which are mounted thecrown-wheels 0 and D) is revolved or driven by means of the revolvinghandle M of the brace and that as the pinion E is mounted upon an axleof the portion G, by means of which it may be made to co-operate orrevolve in conjunction with the crown-wheels O and D, respectively, twomotions are thereby simultaneously imparted to said pinion-namely, amotion by the revolution of the stock or portion G and another motion bythe crownwheels 0 and D, respectively. In other words,

- while the pinion E revolves with the portion G it at the same timeturns upon the projecting axle L, owing to its location between thecrown-wheels O and D, when either of said crown-wheels are heldstationary upon the portion G by means of the pawls a and a of thehandle A. Such being the fact, it is apparcut that said motions may becommunicated alternately to each of the crown-wheels O and Dthat is,when the crown-wheel O is held stationary by the pawl a said motions areimparted to the crown-wheel D, and vice versa when the crown-wheel D isheld stationary by the pawl a Hence the revolutions of either of saidcrown-wheels may be doubled at the option of the operator. When thecrown-wheel C is held stationary, the crownwheel D, owing to themechanism heretofore explained, will cause the bit-holder or socket N tomake two revolutions to each revolution made by the handle M. This isthe important feature of myinvention, and as the same is practicaland-very useful I deem it useless to further enlarge upon its merits.

\Vhat I claim is 1. In a brace, the combination of the portion G,journaled through the center of the frame B and having the reducedportions 9 g g, the crown-wheels C and D, mounted upon the portion G ofthe brace at the points g g, respectively, the clevis shaped frame B,through which the portion G is journaled, the handle A, pivotallysecured between the ends I) b of the frame B and provided with the pawlsfor alternately engaging the crownwheels 0 and D, respectively, the "capI, 10-

cated upon the lower end of the portion Gand having the projections orkeys h h fitting in the orifices cl (1 of the crown-wheel D, and therevolving pinion E, mounted upon the projecting axle of the portion Gand working between the crown-wheels O and D, respectively, allsubstantially as described, and for the purpose set forth.

2. In combination with the co-operating mechanism of a brace, the twocrown-wheels mounted upon the portion G, the clevis-shaped frame locatedupon-the portion G, the handle pivotally secured between the ends ofsaid frame and provided with the pawls for alternately engaging thecrown-Wheels C and D, respectively, the cap located upon the lower endof the portion Gand havingthe projections or keys h h fitting in theorifices in the bottom of the lower of said crown-wheels, and therevolving pinion mounted upon the projecting axle of the portion Gandworking between said crown-wheels, substantially as described and setforth.

In testimony whereof I affix my signature in presence of two witnesses.

GUST. LARSON. lVitnesses:

A. G. BROKER, M. POPPLER.

